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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
The bacterial organisms of BV are always around, but the vagina is designed to defend you if it is well estrogenized and colonized with plenty of lactobacilli! Ideal vaginal pH is about 3.8-4.2, higher pH is alkaline which kills off the protective lactobacilli leaving the BV to take off.